US3220915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Structures comprising vitrified and devitrified mineral fibers
Assignee: Owens Corning
•
Filing: 1960-08-05
•
Granted: 1965-11-30
•
Expires: 1980-08-05
Abstract
No abstract record available.
Inventors
- 👤 Richard F Shannon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:44
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C03; C03C; C03C13/00; C03C13/006; C04B30/00; C04B30/02; C04B2111/00; C04B2111/20; C04B2111/28; Y; Y10; Y10S; Y10S264/00; Y10S264/19; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/24; Y10T428/24777; Y10T428/24793
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
71 words
A MINERAL FIBER STRUCTURE COMPRISING VITRIFIED AND DEVITRIFIED FIBERS BONDED TOGETHER IN THE FORM OF A GENERALLY RECTANGULAR BOARD, SAID VITRIFIED AND DEVITRIFIED FIBERS CONSISTING ESSENTIALLY OF, BY WEIGHT, FROM 42-60% SILICA, 10-20% ALUMINA, 10-35% CALCIA AND 5-10% AMAGNESIA, SAID STRUCTURE HAVING EXCEPTIONSL RESISTANCE TO SAG IMPARTED BY REINFORCING ELEMENTS WHICH COMPRISE AT LEAST A PART OF THE TOTAL STRUCTURE AND WHICH COMPRISES FIBERS THAT HAVE BEEN DEVITRIFIED BY HEAT TREATMENT.
Claim 2
Dependent Claim
71 words
A MINERAL FIBER STRUCTURE COMPRISING VITRIFIED AND DEVITRIFIED FIBERS BONDED TOGETHER IN THE FORM OF A GENERALLY RECTANGULAR BOARD, SAID VITRIFIED AND DEVITRIFIED FIBERS CONSISTING ESSENTIALLY OF, BY WEIGHT, FROM 42-60% SILICA, 10-20% ALUMINA, 10-35% CALCIA AND 5-10% AMAGNESIA, SAID STRUCTURE HAVING EXCEPTIONSL RESISTANCE TO SAG IMPARTED BY REINFORCING ELEMENTS WHICH COMPRISE AT LEAST A PART OF THE TOTAL STRUCTURE AND WHICH COMPRISES FIBERS THAT HAVE BEEN DEVITRIFIED BY HEAT TREATMENT.
Claim 3
Dependent Claim
24 words
THE STRUCTURE OF CLAIM 1 WHEREIN THE DEVITRIFIED FIBERS ARE LOCATED AT THE BORDERS OF THE GENERALLY RECTANGULAR BOARDS TO FORM A REFINFORCING FRAME.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |